test(11-02): add failing tests for auto-scroll to first error on validation failure

- Add scrollIntoView mock (vi.fn()) in beforeEach to both test files
- Add POLISH-04 test in BackendSelectionStep: scrolls to remote-name on empty submit
- Add POLISH-04 test in RemoteConfigStep: scrolls to first errored field on empty submit

src/components/wizard/BackendSelectionStep.test.tsx

@@ -1,7 +1,8 @@
 // @vitest-environment jsdom
 // Covers WIZD-01: card grid renders Azure Blob, Amazon S3, S3-Compatible (Azure first)
 // Covers WIZD-04: remote name field validates alphanumeric/dash/underscore
-import { describe, it, expect } from 'vitest';
+// Covers POLISH-04: auto-scroll to first errored field on validation failure
+import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { render, screen, waitFor } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { WizardProvider } from '../../store/context';
@@ -16,6 +17,10 @@ function renderStep() {
 }
 
 describe('BackendSelectionStep', () => {
+  beforeEach(() => {
+    Element.prototype.scrollIntoView = vi.fn();
+  });
+
   describe('WIZD-01: backend card grid', () => {
     it('renders Azure Blob Storage card', () => {
       renderStep();
@@ -138,4 +143,19 @@ describe('BackendSelectionStep', () => {
       });
     });
   });
+
+  describe('POLISH-04: auto-scroll to first error', () => {
+    it('scrolls to remote-name field when submitted with empty name', async () => {
+      const user = userEvent.setup();
+      renderStep();
+      const nameInput = screen.getByRole('textbox');
+      await user.clear(nameInput);
+      // Submit via Next button with empty name to trigger validation failure
+      const nextButton = screen.getByRole('button', { name: /next/i });
+      await user.click(nextButton);
+      await waitFor(() => {
+        expect(Element.prototype.scrollIntoView).toHaveBeenCalled();
+      });
+    });
+  });
 });